title: [Leading role of genes coding polymerase complex in attenuation of domestic donor viruses for A and B live influenza vaccine].
abstract: OBJECTIVE
  To identify the genes that are responsible for attenuation of donor viruses for live influenza vaccine. MATERIALS AND METHODS. Analysis of phenotypical properties of reassortants of wild type A and B influenza viruses with A/Leningrad/134/17/57 (H2N2) (A17) and B/USSR/60/69 (B60) master donor viruses was performed by comparison of their capability to grow at different temperatures in chicken eggs or/and MDCK cells.
  
  
  RESULTS
  Ts phenotype of 178 reassortants of A17 with current non-ts influenza A wild type viruses and 33 reassortants of B60 with current non-ts influenza B wild type viruses were evaluated. Reassortants inherited two polymerase genes PB2 and PA or PB 1 from A17 regularly demonstrated ts phenotype. The polymerase PA and PB2 gene segments of B60 independently controlled manifestation of ts phenotype of B60 based reassortants. The other nonpolymerase genes played no role in manifestation of ts phenotype of reassortants A17 and B60 viruses.
  
  
  CONCLUSIONS
  The molecular basis for the development ts phenotype of both A and B influenza vaccine reassortant viruses determined by polymerase genes complex.
authors.forename: I V
authors.initials: IV
authors.lastname: Kiseleva
authors.forename: N V
authors.initials: NV
authors.lastname: Larionova
authors.forename: J T M
authors.initials: JT
authors.lastname: Voeten
authors.forename: L C P
authors.initials: LC
authors.lastname: Teley
authors.forename: S K M
authors.initials: SK
authors.lastname: Drieszen-van der Cruijsen
authors.forename: J G M
authors.initials: JG
authors.lastname: Heldens
authors.forename: J F
authors.initials: JF
authors.lastname: van den Bosch
authors.forename: L G
authors.initials: LG
authors.lastname: Rudenko
mesh_terms: D019943:Amino Acid Substitution; D000818:Animals; D002460:Cell Line; D002642:Chick Embryo; D004285:Dogs; D009980:Influenza A virus / Q000235:genetics / Q000276:immunology*; D009981:Influenza B virus / Q000235:genetics / Q000276:immunology*; D007252:Influenza Vaccines / Q000235:genetics / Q000276:immunology*; D012324:RNA-Dependent RNA Polymerase / Q000235:genetics / Q000276:immunology*; D016865:Reassortant Viruses / Q000235:genetics / Q000276:immunology; D012692:Serial Passage; D013696:Temperature; D014613:Vaccines, Attenuated / Q000235:genetics / Q000276:immunology; D014764:Viral Proteins / Q000235:genetics / Q000276:immunology*; D014779:Virus Replication
chemical_list: D007252:Influenza Vaccines; C061290:PA protein, influenza viruses; C502893:PB2 protein, influenza virus; D014613:Vaccines, Attenuated; D014764:Viral Proteins; C077346:influenza virus polymerase basic protein 1; D012324:RNA-Dependent RNA Polymerase